These corner caddies are good, £6.99 on amazon. Lightweight aluminium, come with screws or sticky pads if you'd like them to drop off after a few days
Adhesive Corner Shower Caddy | 2... https://www.amazon.co.uk/dp/B086PXTFP2/?tag=mhf04-21
Adhesive Corner Shower Caddy | 2... https://www.amazon.co.uk/dp/B086PXTFP2/?tag=mhf04-21